I have, more than once, seen ET pax force their way past any protesting zealous CC who are (understandably) doing their best to protect the ‘integrity’ of the CE cabin and its washroom. It’s not a pleasant scenario to witness, and ideally should not happen at all. But - for the very reasons given by simons1 and others - this is the unwelcome reality of life under BoB. And, ultimately, BA know that “I was refused access to toilet facilities” would not make for a great headline in terms of the airline’s public image.

PS : true .... no more Green Shield stamps (sadly) - but whenever I buy a BoB coffee, I do always make sure CC stamp my BoB Loyalty Card, which gives me one free coffee for every six bought.